<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>缺失的第一个正数</title>
</head>
<body>
  <script>
    function fn(nums) {
      nums.sort((a, b) => a - b)
      let num = 1
      for (let i = 0; i < nums.length; i++) {
        if (nums[i] === num) {
          num++
        }
      }
      return num
    }
    console.log(fn([1, 2, 0]))
  </script>
</body>
</html>